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Mendelevium Md (Element 101) of Periodic Table

Mendelevium Md (Element 101) of Periodic Table

101 Md (Mendelevium)

Mass number – 258

Atomic weight – 258.0951 g/mol

Atomic number (Z) – 101

Electrons: 101

Protons: 101

Neutrons: 157

Period – 7

Block – f

Element category – Actinide

Electrons per shell – K2, L8, M18, N32, O31, P8, Q2

Electron configuration – 1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p65f137s2

Phase – Solid

Melting point – 1100 k (827 oC)

Density – 10.3(7) g/cm3

Half Life(s) – 4450000

Lifetime(s) – 6420000

Appearance – Radioactive metal

Atomic radius – 287 pm

Oxidation states – 2, 3

Electronegativity – Pauling scale: 1, 3

Valence – 3

Ionization energies – 1st: 653 kJ/mol

Crystal structure – Face-centered cubic

CAS Number – 7440-11-1

Naming – After Dmitri Mendeleev

Discovery – Lawrence Berkeley National Laboratory (1955)

Isotopes – 257Md 258Md 260Md

Uses – Mendelevium is used only for research.

Natural abundance –  It is made by bombarding einsteinium with alpha particles (helium ions)

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